SmogRank / World / Australia / September 2025
Most polluted cities in Australia, September 2025
2 cities in Australia ranked by their average PM2.5 over the 30 days. Worst: Sydney at 5.7 µg/m³, #1,982 of 2,711 cities in the world. Cleanest: Melbourne at 1.6. A city needs measurements on 70% of the days to be ranked.
Low1–3
Moderate4–6
High7–9
Very high10
The UK's Daily Air Quality Index (1 to 10), PM2.5 bands. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
All cities in the world, September 2025 · Australia now
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SmogRank, most polluted cities in Australia, PM2.5, September 2025, smogrank.com/au/history/2025-09 (accessed 2 Oct 2026).
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